The Study of Chemistry

The Study of Chemistry - 1 The Study of Chemistry Chemistry...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 1. The Study of Chemistry Chemistry involves studying the properties and behavior of matter. Matter is the physical material of the universe; anything that has mass and occupies space. A Property is anything that allows us to distinguish all different types of matter. Atoms are the very small building blocks of matter. Properties relate to the kinds of atoms matter contain ( Composition ), and the arrangement of those atoms ( Structure ). Atoms combine to form molecules , in which two or more atoms join in specific shapes. 2. Classifications of Matter Ways of Classifying Matter: 1. Physical State: a. Gas – No fixed volume or shape, rather, it conforms to the volume and shape of its container. Can be compressed and expanded. Molecules are far apart, moving at a fast pace. b. Liquid – Distinct volume, no distinct shape. Cannot be compressed. Molecules move slower, and are more tightly packed. c. Solid – Distinct volume and shape. Cannot be compressed. Molecules move very little, and are held tightly together. 2. Composition: a. Element – Cannot be decomposed into simpler substances. There are 116 known elements. i. A pure substance has distinct properties, and a composition that doesn’t vary from sample to sample. b. Compound – Substances composed of two or more elements. i. The Law of Constant Composition says that the composition of a pure compound is always the same (Proust). c. Mixture – Combinations of two or more substances, where each substance retains its own chemical identity. Composition of mixtures can vary. i. Heterogeneous Mixtures vary in texture and appearance throughout any sample. ii. Homogenous Mixtures (Solutions) are uniform throughout. 3. Properties of Matter Physical properties can be measured without changing the identity and composition of the substance. Ex: Color, Odor, Density, Melting Point, Boiling Point, Hardness Physical changes are changes in a substances appearance. Ex: Evaporation, Changes of State (Liquid to Gas, Liquid to Solid) Chemical properties describe the way a substance may react to form other substances. Ex: Flammability Chemical changes change the substance into a chemically different substance. Intensive properties do not depend on the amount of the sample. Ex: Temperature, Melting Point, Boiling Point Extensive properties depend on the quantity of the sample. Ex: Mass, Volume Separation of Mixtures: Because components of a mixture retain their own properties, different processes, such as filtration and distillation, can be used to separate the components. 4. Units of Measurement SI Units are the base units from which all other units of measure are derived. Meter is the base unit for length; Kilogram is the base unit mass. Mass is the amount of material in an object, which is different from the weight, the force that a mass exerts due to gravity. m^3 the base unit for volume, while Liter is also frequently used....
View Full Document

This note was uploaded on 04/14/2008 for the course CHEM 121 taught by Professor Wyzlouzil during the Spring '07 term at Ohio State.

Page1 / 23

The Study of Chemistry - 1 The Study of Chemistry Chemistry...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online